In this study, an experimental scheme is developed to visualize asphalt binder absorption within aggregate pores using scanning electron microscopy. A suitable sample preparation approach, image magnification levels, and image processing techniques are utilized for the visualization of the aggregate pores (pore structure and binder occupancy) before and after adding asphalt binder. Three types of aggregate—gneiss, quartzite, and sandstone—are used in this study. The results indicate that sandstone exhibits maximum binder absorption, followed by gneiss, and then quartzite. Sandstone also shows the highest pore occupancy, indicating that a higher pore area enables more binder absorption. Further, the study highlights a progressive decrease in the absorption level as one moves from the aggregate boundary toward its interior.
KandhalP. S.LeeD. Y.Asphalt Absorption as Related to Pore Characteristics of Aggregates. Highway Research Record, Vol. 404, 1972, pp. 97–111.
2.
LeeD. Y.GuinnJ. A.KhandhalP. S.DunningR. L.Absorption of Asphalt into Porous Aggregates. No. SHRP-A/UIR-90-009. Strategic Highway Research Program, National Research Council, Washington, D.C., 1990.
3.
LeeD. Y.Absorption of Asphalt by Aggregate. No. ISU-ERI-AMES-67300. Iowa State University, Ames, submitted to Iowa State Highway Commission, 1970.
4.
KandhalP. S.KhatriM. A.Relating Asphalt Absorption to Properties of Asphalt Cement and Aggregate. Transportation Research Record: Journal of the Transportation Research Board, 1992. 1342: 76–84.
5.
Fugro Consultants, and Arizona State University. A Performance-Related Specification for Hot-Mixed Asphalt. NCHRP Report 704. Transportation Research Board, Washington, D.C., 2011.
6.
RobertsF. L.KandhalP. S.BrownE. R.LeeD. Y.KennedyT. W.Hot Mix Asphalt Materials, Mixture Design and Construction. National Asphalt Pavement Association Research and Education Foundation, Lanham, MD, 1996.
7.
KandhalP. S.KhatriM. A.Evaluation of Asphalt Absorption by Mineral Aggregates. National Center for Asphalt Technology (NCAT), Report No. 91-4. National Center for Asphalt Technology, Auburn, Alabama, 1991.
8.
RouquerolJ.AvnirD.FairbridgeC. W.EverettD. H.HaynesJ. M.PerniconeN.RamsayJ. D. F.SingK. S. W.UngerK. K.Recommendations for the Characterization of Porous Solids (Technical Report). Pure and Applied Chemistry, Vol. 66, No. 8, 1994, pp. 1739–1758.
9.
GaoQ. F.JradM.HattabM.FleureauJ. M.AmeurL. I.Pore Morphology, Porosity, and Pore Size Distribution in Kaolinitic Remolded Clays Under Triaxial Loading. International Journal of Geomechanics, Vol. 20, No. 6, 2020, p. 04020057.
10.
AnovitzL. M.ColeD. R.Characterization and Analysis of Porosity and Pore Structures. Reviews in Mineralogy and Geochemistry, Vol. 80, No. 1, 2015, pp. 61–164.
11.
ZhangN.HeM.ZhangB.QiaoF.ShengH.HuQ.Pore Structure Characteristics and Permeability of Deep Sedimentary Rocks Determined by Mercury Intrusion Porosimetry. Journal of Earth Science, Vol. 27, 2016, pp. 670–676.
12.
SongR.ZhengL.WangY.LiuJ.Effects of Pore Structure on Sandstone Mechanical Properties Based on Micro-CT Reconstruction Model. Advances in Civil Engineering, Vol. 2020, 2020, pp. 1–21.
13.
CallowB.Falcon-SuarezI.Marin-MorenoH.BullJ. M.AhmedS.Optimal X-Ray Micro-CT Image-Based Methods for Porosity and Permeability Quantification in Heterogeneous Sandstones. Geophysical Journal International, Vol. 223, No. 2, 2020, pp. 1210–1229.
14.
SafariH.BalcomB. J.AfroughA.Characterization of Pore and Grain Size Distributions in Porous Geological Samples–An Image Processing Workflow. Computers & Geosciences, Vol. 156, 2021, p. 104895.
15.
ZhangY.JinS.WangY.WangY.Characterization of the Pore Size Distribution with SEM Images Processing for the Tight Rock. Proc., IEEE International Conference on Information and Automation, Lijiang, China, IEEE, New York, NY, 2015, pp. 653–656.
16.
MunawarM. J.VegaS.LinC.AlsuwaidiM.AhsanN.BhaktaR. R.Upscaling Reservoir Rock Porosity by Fractal Dimension Using Three-Dimensional Micro-Computed Tomography and Two-Dimensional Scanning Electron Microscope Images. Journal of Energy Resources Technology, Vol. 143, No. 1, 2021, p. 013003.
17.
TimurA.HempkinsW. B.WeinbrandtR. M.Scanning Electron Microscope Study of Pore Systems in Rocks. Journal of Geophysical Research, Vol. 76, No. 20, 1971, pp. 4932–4948.
18.
DeshpandeR. R.DasA.Asphalt Binder Adsorption by Aggregates: A Microscopic Study. Road Materials and Pavement Design, Vol. 19, No. 8, 2017, pp. 1734–1749.
19.
LiJ.WangM.JiangC.LuS.LiZ.Sorption Model of Lacustrine Shale Oil: Insights from the Contribution of Organic Matter and Clay Minerals. Energy, Vol. 260, 2022, p. 125011.
20.
LiuZ.DengD.De SchutterG.YuZ.Micro-Analysis of “Salt Weathering” on Cement Paste. Cement and Concrete Composites, Vol. 33, No. 2, 2011, pp. 179–191.
21.
WongH. S.ZhaoY. X.KarimiA. R.BuenfeldN. R.JinW. L.On the Penetration of Corrosion Products from Reinforcing Steel into Concrete due to Chloride-Induced Corrosion. Corrosion Science, Vol. 52, No. 7, 2010, pp. 2469–2480.
22.
NijlandT. G.LarbiJ. A.Microscopic Examination of Deteriorated Concrete. In Non-Destructive Evaluation of Reinforced Concrete Structures (C. Maierhofer C, H-W. Reinhardt, and G. Dobmann, eds.), Woodhead Publishing, Cambridge, 2010, p.242.
23.
WangY.LiB.Determination of the Sequence of Intersecting Lines from Laser Toner and Seal Ink by Fourier Transform Infrared Micro Spectroscopy and Scanning Electron Microscope/Energy Dispersive X-Ray Mapping. Science & Justice, Vol. 52, No. 2, 2012, pp. 112–118.
24.
DanildeNamorA. F.NuaimM. A.FaircloughG.KhalifeR.Al HakawatiN.Amine-Modified Silica for Removing Aspirin from Water. International Journal of Environmental Science and Technology, Vol. 19, No. 5, 2022, pp. 4143–4152.
25.
ASTM International. Standard Test Method for Relative Density (Specific Gravity) and Absorption of Coarse Aggregate (ASTM C127-24). ASTM International, West Conshohocken, PA, 2024.
26.
ASTM International. Standard Test Method for Softening Point of Bitumen (Ring-and-Ball Apparatus) (ASTM D36/D36M-14e1). ASTM International, West Conshohocken, PA, 2014.
27.
ASTM International. Standard Test Method for Penetration of Bituminous Materials (ASTMD5/D5M-13). ASTM International, West Conshohocken, PA, 2013.
28.
ASTM International. Standard Test Method for Viscosity Determination of Asphalt at Elevated Temperatures Using a Rotational Viscometer (ASTM D4402/D4402M-15). ASTM International, West Conshohocken, PA, 2015.
29.
U.S. Department of Transportation Federal Highway Administration. Rock and Mineral Identification for Engineers. U.S. Department of Transportation Federal Highway Administration, Washington, D. C., 1991.
30.
PrietoA.YustaI.ArrizabalagaA.From Petrographic Analysis to Stereomicroscopic Characterisation: A Geoarchaeological Approach to Identify Quartzite Artefacts in the Cantabrian Region. Archaeological and Anthropological Sciences, Vol. 12, No. 1, 2020, p. 32.
31.
KhanlariG.RafieiB.AbdilorY.An Experimental Investigation of the Brazilian Tensile Strength and Failure Patterns of Laminated Sandstones. Rock Mechanics and Rock Engineering, Vol. 48, 2015, pp. 843–852.
ASTM International. Standard Practice for Calculating Percent Asphalt Absorption by the Aggregate in an Asphalt Pavement Mixture (ASTM D4469-17), ASTM International, West Conshohocken, PA, 2017.
36.
ASTM International. Standard test Methods for Quantitative Extraction of Bitumen from Bituminous Paving Mixtures. (ASTM D2172/D2172M-11). ASTM International, West Conshohocken, PA, 2011.
37.
ASTM International. Standard Test Method for Theoretical Maximum Specific Gravity and Density of Bituminous Paving Mixtures (ASTM D2041/D2041M-11). ASTM International, West Conshohocken, PA, 2011.
